LLVM/Clang still doesn't have support for OpenMP. More result data from this GCC vs. LLVM/Clang compiler comparison on ARM can be found on OpenBenchmarking.org (though ignore the Fortran FFTE test that accidentally slipped in there). LLVM/Clang on this dual-core OMAP4460 SoC was much less competitive than GCC 4.6, though it will be interesting to do this comparison with GCC 4.7 and the forthcoming LLVM/Clang 3.1. I'll also run some compiler benchmarks from the quad-core NVIDIA Tegra 3 ARM tablet.

On the ARM side, there is great interest with LLVM/Clang. Qualcomm is even trying to use Clang to build an ARM Linux kernel and other software with the LLVM-based compiler rather than GCC. Going forward the ARM Clang performance on Linux should certainly improve.